Euphytica

, Volume 186, Issue 1, pp 233–245

Mapping QTLs with epistatic effects and QTL × treatment interactions for salt tolerance at seedling stage of wheat

  • Yun-Feng Xu
  • Diao-Guo An
  • Dong-Cheng Liu
  • Ai-Min Zhang
  • Hong-Xing Xu
  • Bin Li
Article

Abstract

Quantitative trait loci (QTLs) with additive (a), additive × additive (aa) epistatic effects, and their treatmental interactions (at and aat) were studied under salt stress and normal conditions at seedling stage of wheat (Triticum aestivum L.). A set of 182 recombinant inbred lines (RILs) derived from cross Xiaoyan 54 × Jing 411 were used. A total of 29 additive QTLs and 17 epistasis were detected for 12 traits examined, among which eight and seven, respectively, were identified to have QTL × treatment effects. Physiological traits rather than biomass traits were more likely to be involved in QTL × treatment interactions. Ten intervals on chromosomes 1A, 1D, 2A (two), 2D, 3B, 4B, 5A, 5B and 7D showed overlapping QTLs for different traits; some of them represent a single locus affecting different traits and/or the same trait under both treatments. Eleven pairs of QTLs were detected on seemingly homoeologous positions of six chromosome groups of wheat, showing synteny among the A, B and D genomes. Ten pairs were detected in which each pair was contributed by the same parent, indicating a strong genetic plasticity of the QTLs. The results are helpful for understanding the genetic basis of salt tolerance in wheat and provide useful information for genetic improvement of salt tolerance in wheat by marker-assisted selection.

Keywords

Epistasis QTL × treatment Salt tolerance Quantitative trait locus (QTL) Wheat 

Abbreviations

CHL

Chlorophyll content (SPAD value)

MAS

Marker-assisted selection

N

Normal water treatment

QTL

Quantitative trait locus

Q × E

QTL × environment

Q × T

QTL × treatment

a

Additive

aa

Additive × additive

at

Additive × treatment

aat

Epistasis × treatment

RDW

Root dry weight

RIL

Recombinant inbred line

RKC

Root K+ concentration

RKN

Root K+/Na+ concentration ratio

RL

Root length

RNC

Root Na+ concentration

S

Salt stress treatment

SDW

Shoot dry weight

SH

Shoot height

SII

Salt injury index

SKC

Shoot K+ concentration

SKN

Shoot K+/Na+ concentration ratio

SNC

Shoot Na+ concentration

TDW

Total dry weight

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Yun-Feng Xu
    • 1
  • Diao-Guo An
    • 1
  • Dong-Cheng Liu
    • 2
  • Ai-Min Zhang
    • 2
  • Hong-Xing Xu
    • 1
  • Bin Li
    • 2
  1. 1.Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuangChina
  2. 2.State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijingChina

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